OF NORTHUMRERLAND AND DURHAM. 199 
terminal slightly tubular, tuberculated or echinated, and divided 
at the top into six pointed segments, Anal aperture about one- 
third down the body on the upper side, sub-tubular, slightly 
tuberculated and divided into four segments, shorter than those 
of the branchial aperture. Length three-eighths of an inch. 
On the under side of stones between tide-marks, Cullercoats 
and Whitley, not common. 
125. ASCIDIA, Linneus. 
* Cylindrical or rounded, and partially attached. 
1. A. INTESTINALIS, Linn. 
Ascidia intestinalis, Forb. and Hanl. Brit. Moll. 1. 31. 
Not uncommon between tide-marks ; laterally attached to 
stones at its posterior extremity. It inhabits various depths, 
and is occasionally brought in on the fishing lines. Those from 
deep water are larger than the shore variety, and of a greenish 
yellow colour. This species is flaccid, when out of water, and 
very contractile. 
2. A. sorpipa, Ald. and Hane. 
Body ovate, of a dull semi-transparent yellowish white, nearly 
smooth, but coarse and with an uneven surface ; attached by a 
narrow base. Apertures terminal and not far apart, papillose or 
very slightly tubular, more or less echinated or tuberculated ; 
the branchial aperture eight-cleft, the anal six-cleft, with a red 
eye-spot at the base of each division. Outer tunic transparent, 
vitreous, and colourless, rather tough, with very little power of 
contraction or expansion. Inner tunic about one-third less than 
the outer one, soft, yellowish, and generally very much blotched 
and spotted with crimson, towards the upper end. Branchial 
sac, with small even reticulations a little thickened at the inter- 
sections. Circle of tentacular filaments simple and slender. 
Length about two inches ; breadth an inch and a quarter; but 
very variable in size. 
This is one of the commonest Ascidice brought in on the fish- 
ing lines at Cullercoats. It is usually attached to corallines ; 
occasionally to shells and other substances. In its young state 
it is gregarious, and is found in clusters on Gemellaria loriculata, 
